Here are my secrets:
1) if you are eligible for one and want to travel in a certain season, try to get it at the end of that season (summer) so that you have an entire calendar year before that season comes up again. For me that's summer and I try to get mine by about the end of August.
2) if you have somewhere that you want to go that is in the grid, just grab it when the place you want comes up. You need to look at the web site regularly (daily).
3) if you want to travel in high season, or the season mentioned in 1 above, you'll probably need to do it in flexchange. Again, you'll need to look at the web site daily.
The last three excanges I've received for my 1BR AC are:
- 3BR Grande Vista, last week of June (flexchange)
- 1BR Old Key West, Martin Luther King week in January (grid)
- 2BR Grand Vista, Thanksgiving week (grid)
FWIW, I use the same flexchange approach with my studios if they don't match an ongoing trade.